Uses a dual vent system, generally two 3" flex gas lines, one pipe is for exhaust, while the other pipe brings in outside air for combustion. The design of these inserts allows for a completely sealed system that does not compromise inside air quality of your home.

Uses a dual vent system, generally two 3" flex gas lines, one pipe is for exhaust, while the other pipe brings in outside air for combustion. The design of these inserts allows for a completely sealed system that does not compromise inside air quality of your home.